diff options
| author | Tariq Toukan <tariqt@mellanox.com> | 2017-06-15 14:35:37 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-06-16 05:53:23 +0300 |
| commit | 6c78511b0503c9b53fd0f5ccc8b28d5e94a3dfcb (patch) | |
| tree | 3e1e040b393aa76fb287bc8c6b13775b653324f6 /drivers/net/ethernet/mellanox/mlx4/en_tx.c | |
| parent | 36ea7964982f54370e051386b74df914c53e2219 (diff) | |
| download | linux-6c78511b0503c9b53fd0f5ccc8b28d5e94a3dfcb.tar.xz | |
net/mlx4_en: Poll XDP TX completion queue in RX NAPI
Instead of having their own NAPIs, XDP TX completion queues get
polled within the corresponding RX NAPI.
This prevents any possible race on TX ring prod/cons indices,
between the context that issues the transmits (RX NAPI) and the
context that handles the completions (was previously done in
a separate NAPI).
This also improves performance, as it decreases the number
of NAPIs running on a CPU, saving the overhead of syncing
and switching between the contexts.
Performance tests:
Tested on ConnectX3Pro, Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz
Single queue no-RSS optimization ON.
XDP_TX packet rate:
-------------------------------------
| Before | After | Gain |
IPv4 | 12.0 Mpps | 13.8 Mpps | 15% |
IPv6 | 12.0 Mpps | 13.8 Mpps | 15% |
-------------------------------------
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Cc: kernel-team@fb.com
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/en_tx.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/en_tx.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c index 01bb43879221..500442c60342 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c @@ -395,8 +395,8 @@ int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring) return cnt; } -static bool mlx4_en_process_tx_cq(struct net_device *dev, - struct mlx4_en_cq *cq, int napi_budget) +bool mlx4_en_process_tx_cq(struct net_device *dev, + struct mlx4_en_cq *cq, int napi_budget) { struct mlx4_en_priv *priv = netdev_priv(dev); struct mlx4_cq *mcq = &cq->mcq; @@ -1176,6 +1176,7 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring, tx_drop_count: rx_ring->xdp_tx_full++; + *doorbell_pending = true; tx_drop: return NETDEV_TX_BUSY; } |